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    Re: Say it aint so......
    From: James N Wilson
    Date: 2009 Mar 8, 19:19 -0700

    Guy:
    
    As a long time Power Squadron instructor, I have found that any sight
    reduction method they have taught is more accurate than the sight data.
    The three mile criterion was aimed at greater rigor in the sight taking
    process. When I was a student, I had no problem with Ageton for my JN
    sights with a five mile accuracy requirement, nor with HO 229 for my N
    sights with the three mile requirement. Now I take sights with my
    students, and have used the NASR method, and now the calculator, with no
    problems with accuracy. Having to plot a LOP to get the distance to or
    from the DR introduces another source of error, which Ageton, NASR and
    the calculator avoid.
    
    Incidentally, I'm surprised that the three mile accuracy requirement has
    been restored. I was at the meeting of the Power Squadron Offshore
    Navigation Committee where the decision was made to make the requirement
    five miles. I objected and was overruled.
    
    Jim Wilson
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